Tok of sax  fb ax-cisco



(No Model.) u 2 Sheets-Sheet 2. W. E. STIRK.

ORE GONGENTBATOR.

Mn/7( VM UNITED -Sfrnrns PATENT Ottica.

VILLIAINI E. STIRK, OF LEADVILLE, COLORADO, ASSIGNOR TO A. P. BRAY- TON, OF SAN FRANCISCO, CALIFORNIA. l

one-CONC'ENTRATOR.

SPECIFICATION forming part of Letters Patent No. 286,342, dated etober 9, 1883. Application filed September 1B, 1882. (No model.)

To all whom it may concern: Be it known that l, XVILLIAM E. S'rinl, of Leadville, county of Lake, State of Colorado, have` invented an Improved OieConcentrator; and I hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to certain improvements in ore-concentrators having a combined rotary and shaking or oscillating movement for the purpose of separating the valuable heavy particles from the worthless lighter dbris. v

My invention consists iu certain combinations of devices, which constitute an improvement on the coneentrator patented to .I os. S.

Duncan, 'February 28, 1882,"all of which will be more fully explained `by reference to the accompanying drawings, in which-- Figure 1 is a vertical section of my improved '20 concentrator. Fig. 2 is a perspective view of the pan, and Fig. 3 is a perspective View of the machine complete.

A is a pan. 'BE is acont-ral hollow discharge shaft or post,

which is xed to the foundation timbers or support.

D is a sleeve surrounding the upper part of the hollow shaft or post B, and having the Y short inner iiange, d, iitting over the top ofthe post to protect it from grit and wear.

a is a wide flat flange, which extends outward from the sleeve D, forming a part of it, and it forms by its thickness a slight dam to arrest the lower stratum of sand as it flows towards the central opening.

y, The outer portion of the pan A is usually made of stout sheet-iron riveted to the bottom of the flange a, which thus proj ects above it, as shown.

4o My improvement consists in providing thin metal rings, Q of such a'size as to fit snugly around the flange a., and to project above it.

` Several of these' rings of different depths may be fitted to this flange, so that any depth of sand may be maintained, or theyrare, preferably, iitted one over another, or telescoped, as shown, so as to produce the desired height, and allow it to be regulated from time to time to suit the work to be done. The bottom of 5o the pau A slopes downward to the periphery,

where it cur-ves up to form the sides, so that a channel, b, is formed around the outer edge of the pan, within its periphery, into which the sulphurets and heavy valuable particles,

of whatever nature, are caused to settle by the peculiar oscillating rotary motion of the pan. The pan is caused to rotate by means of a bevelgear wheel, H, which is secured to the sleeve C, surrounding the lower part of the post B, and havingaflange, c, upon which the 6o bottom flange, d, of the sleeve D rests. This gear is 4engaged and driven' by a pinion, I, upon the driving-shaft J. A spur-gear wheel,

O, is fixed to the foundation-timbers, and a pinion, N, is fixed to the bottom of a vertical 6 5 shaft, H, so as to engage. with this spur-gear. The shaft lll is supported from a bracket, L, which is bolted to the bevel-gear H, so that said shaft is carried around with this gearwheel, and is at the same time caused to rotate 7o upon its own axis by its pinion Nengaging the stationary gear-wheel O. A plate or disk,

P', is fixed to the top of the shaft M, and has an eccentric pin, p, projecting upward from it. A conneetingrod, R, connects this eccen- 7 5 tric pin or crank p with the bottom of the pan,

so that by the revolution'of the shaft M and plate Il upon their own axis the pan is given a secondary shaking motion while revolving about the main central shaft. The two loose 8O sleeves C and D around the central shaftpermit this movement, which is very efficient in separating the sulphurcts 'and gold from the lighter debris, and settling the particles to the bottom. In order to regulate and grade the discharge of these particles more completely than could be done by ordinary round holes or openings, I form one or more elongated slots, l?, which extend from the outside toward the central flange, a, about one-half the distance from the periphery, more or less. These slots areprovided with controlling gates or slides,

`which may open or close them to any desired degree. The gate H' is hinged near the inner end of the slot, and is slightly curved, as shown, 9 5 so that when the outer end is moved by its lever or handle T the slot will be opened the entire length, and present an opening which is Widest at the outer end, and becomes grad ually narrower toward the center of the pan. 13o

This allows the sulphurets, which accumulate faster toward the outside, to be discharged evenly along the whole length of the slot. Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The pan A, having peripheral channel b and central flange, a, and the hollow central discharge-post, B, in combination with the adjustable rings Q, fitting said central flange or projection, d, substantially as herein described.

2. The panA, having the radial Slots P, the controlling-gates H', and adjustable rings Q, in combination with the discharge-post B, and 

